<!DOCTYPE html>
<html lang="zh-CN">
     <head>
         <title>do app</title>
         <meta charset="utf-8">  
         <link rel="stylesheet" href="css/flex.css">
         <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
         <script src="rem.js"></script>
     </head>
     <body>
        
        <div class="box">
            <div class="box1"></div>
            <div class="box2"></div>
            <div class="box3"></div>
            <div class="box4"></div>
            <div class="box5"></div>
            <div class="box6"></div>
        </div>
        
     </body>
</html>